You might try a search for pictures of leaf miners since it sounds like the trails match your description and feverfew is susceptable (at least to Liriomyza trifolii (sp?)). If so, there are a few organic controls for them like parasitic wasps but insecticides don't work too well since the eggs are put inside the plant leaf. Hope it helps.

Thank you Makalu! I did a google search and I think your suspicions are right... How sad. :( Im going to see if I can track down something to rid them before they get to the flower pods. Do you have any suggestions as to what would work? my gardening store near by isn't all that helpful..

Thanks again,

Everything that I read says that the systemic perticides are the only ones that work from the chemical side and you can't use them if you're using the plant for anything but ornamental purposes. There are some parasites and nematodes that can work but they somewhat variety specific and you'd probably need to order them online to get the right ones.

I think you're doing the right thing now ... as soon as you see any damage at all, pick the leaf and destroy it. This will hopefully reduce the population to the point that the feverfew can continue to outgrow any attacks. Feverfew is a pretty tough plant and can stand a decent amount of insect damage before the flowers are compromised. And once it flowers, deadhead it - I don't know about pollination on a patio but it readily self seeds everywhere if it gets half a chance.